I am modeling a machine in matlab. when I am running in matlab i get this erros. can any one help me "Derivative input 1 of Integrator' at time 0.6017919970703128 is Inf or NaN. Stopping simulation. There may be a singularity in the solution. If not, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances)".
I guess that a simulation gets some very big value or division by zero. Could you check this in the code or upload the code here?
It is difficult to give an exactly answer without to know the equations that the solver is trying to integrate. Inf comes normally from division by zero. NaN (not a number) could appear because of many reasons. For example, if you have a square root operation and the radicand becomes negative, then variables becomes complex and the next steps in the simulation can be incompatible with complex numbers producing a NaN answer.
Dear Murikipudi, I faced this problem many times, try to reduce the step size or change your solver in Matlab by checking the simulation properties.
Best Regards
Ashraf
Dear Murikipudi Nagaraju,
Try the suggested modifications on step size and solver. if the problem is not solved, check the derivative block input signal, for abrupt change, the derivative is INF, or check the integrator output, for unbounded signal, it can also reach INF.
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